[Android] Add a transparent Activity in Chrome to handle Browser Action Intent

chrome/android/java/res/values-v17/styles.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Q: Why put style resources under values-v17/ ?
          A: Problem:
             1. paddingStart causes a crash on Galaxy Tab&Note b/8351339.
             2. So we wrote a build script(generate_v14_compatible_resources.py) to convert
@@ skipping 41 matching lines @@
 
     <style name="FullscreenWhite" parent="Theme.AppCompat.Light" >
         <item name="android:windowBackground">@android:color/white</item>
         <item name="android:textColorLink">@color/light_active_color</item>
         <item name="colorPrimaryDark">@android:color/black</item>
         <item name="colorPrimary">@color/light_active_color</item>
         <item name="colorAccent">@color/light_active_color</item>
         <item name="windowNoTitle">true</item>
     </style>
 
+    <style name="FullscreenTransparentActivityTheme" parent="Theme.AppCompat.Light" >
+        <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:windowContentOverlay">@null</item>
+        <item name="android:windowIsFloating">true</item>
+        <item name="android:windowIsTranslucent">true</item>
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+    </style>
+
     <style name="FullscreenWhiteActivityTheme" parent="FullscreenWhite">
         <item name="windowActionBar">false</item>
     </style>
 
     <!-- Web app themes -->
     <style name="WebappTheme" parent="MainTheme">
         <item name="android:windowBackground">@null</item>
         <item name="android:windowDisablePreview">true</item>
     </style>
     <style name="WebappSplashScreenTextTheme">
@@ skipping 643 matching lines @@
     <style name="IncognitoNewTabLearnMoreLink">
         <item name="android:background">?attr/listChoiceBackgroundIndicator</item>
         <item name="android:clickable">true</item>
         <item name="android:focusable">true</item>
         <item name="android:textSize">14sp</item>
         <item name="android:textAllCaps">true</item>
         <item name="android:padding">16dp</item>
     </style>
 
 </resources>